New DatasetExtractor using a DatasetWorker

Closes #3 and #6

See merge request workers/generic-training-dataset!8

Publish worker preprod

See merge request workers/generic-training-dataset!11

Always use latest base-worker

See merge request workers/generic-training-dataset!10

This reverts commit fdc2dd83.

Publish worker preprod

See merge request workers/generic-training-dataset!9

Bump arkindex-base-worker to 0.3.5rc1

See merge request workers/generic-training-dataset!7

Update docker build image

See merge request workers/generic-training-dataset!6

Bump arkindex-base-worker & arkindex-export

See merge request workers/generic-training-dataset!5

Update Gitlab registry URL

See merge request workers/generic-training-dataset!3

Implement worker

Closes #2

See merge request teklia/workers/generic-training-dataset!2